It has long been known that Hollywood was actively involved in shaping US public opinion during World War II. Less well documented are the ways in which Washington sought to work behind the scenes, subtly obliterating the boundaries between "studio" and "government" films. Michael Berkowitz studies the contributions of humorist and best-selling author Leo Rosten (The Joys of Yiddish, The Education of H*Y*M*A*N* K*A*P*L*A*N) and writer,...